Small, body usually amoeboid; 1 or more Order MONADIDA.
flagella; no mouth
Small; plasmic collar around the Order CHOANOFLAGELLIDA.
flagellum
With 2 or more flagella; one trails Order HETEROMASTIGIDA.
behind
With 3 or more flagella, none of which Order POLYMASTIGIDA.
trails
Large; firm body wall; 1 or 2 flagella; Order EUGLENIDA.
mouth or pharynx, or both
Medium size; with chlorophyll, Order PHYTOFLAGELLIDA.
no mouth, usually colonial
Small; silicious skeleton; parasitic Order SILICOFLAGELLIDA.
on Radiolaria or free (One genus,
_Distephanus_ Stöhr)